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Question 1

Heat is supplied to a system such that, the temperature of system rises by 30 °C. This temperature rise is equivalent to a temperature rise of
(A) 30 K
(B) 54 F
(C) 303 K
(D) 62 K
Which of the above options are correct?

Question 2

Estimate the entropy(kJ/min-K) produced during heat transfer for a system at 520 K receives 7500 kJ/min from a source at 1100 K. The temperature of atmosphere is 297 K. Assuming that the temperatures of system and source remain constant during heat transfer

Question 3

Consider the steady flow of air through an insulated nozzle. The pressure and temperature at the inlet are 120 kPa and 320 K, respectively. The outlet pressure is 1 bar. The inlet velocity is very

small and the air undergoes a reversible adiabatic process. The outlet velocity, in m/s, is

Question 4

A sample of vapour is maintained initially at 22 atm pressure, and 5 . It was allowed to expand adiabatically to a final pressure of 1 atm and in this process, its temperature fell by 10 K. The value of the Joule Thompson coefficient of the vapour, assuming it to remain constant over this temperature range is_______

Question 5

In an Otto cycle air at 25°C and 1bar is compressed adiabatically compressed & Heat is added at constant volume until the pressure increases to 40 bar, the compression ratio is 6. Calculate mean effective pressure(bar) of the cycle. (R=0.287kJ/kgK, Cv =0.718kJ/kgK)

Question 6

An R-12 plant working on ideal vapour compression cycle between 0.14 MPa and 0.8 MPa develops 4 tonnes of refrigeration. The volume flow rate handled by the compressor is
 
Use the following data:
At P = 0.14 MPa, h1 = 236.05 kJ/kg, s1 = 0.9322 kJ/kg K, v1 = 0.12 m3/kg
At P = 0.8 MPa, h2 = 272.05 (superheated vapour), h3 = 93.42 kJ/kg (saturated liquid)

Question 7

In a an air craft refrigeration system air enter the compressor at a pressure of 0.2 MPa at a temperature of 280 K, air is compressed to the pressure of 400 kPa with an isotropic efficiency of 80%. After being cooled to 320 K at constant pressure, it is expanded to a pressure of 200 kPa with an isotropic efficiency of 80%. Find COP . [Assume gas is ideal.]

Question 8

A steam power plant working on Rankine cycle having saturated vapour at the exit of turbine. Steam enters the turbine at 20 bar, 350oC (hg=3150 kJ/kg,) and leaves the turbine at 0.06 bar (hf=172.24 kJ/kg, hfg=2360kJ/kg). Neglect pump work, find the efficiency of the cycle in percentage.

Question 9

A reciprocating compressor working between pressure limit of 1 bar and 10 bar. The bore and stroke of the cylinder is 20 cm and 35 cm respectively. If clearance volume is 500 cc, find the volumetric efficiency of the compressor.(n=1.25)

Question 10

The equation of Mohr circle is given by (σ – 4)2 + τ2 = 9, where σ is the normal stress and τ is the shear stress. The major principal stress is?

Question 11

For the given simple supported beam, the equation of shear force at any section is given by
Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\04_SOM_BLok_files\image138.png
The maximum bending moment in the beam is KNm.
Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\04_SOM_BLok_files\image139.png

Question 12

A steel tube having an inner radius of 1 cm and an outer radius 2.5 cm is covered with asbestos of thickness 3cm. the temperature difference between the outer surface of asbestos and the inner surface of the steel is 600. Ksteel= 19 W/mK and Kasbestos= 0.2 W/mK. Calculate the heat transfer rate per unit length of the pipe in W/m

Question 13

The spectral emissive power for a diffuse emitting surface for the surface having properties as given below is __________ W/

Question 14

A 10 mm diameter aluminium wire is twisted through one complete revolution without exceeding a shearing stress of 40 N/mm2. The length of the wire is ____ m.
[Take G = 2.7 × 104 N/mm2]

Question 15

An Epicyclic arrangement of gears is shown below.


Gear A makes 2 revolutions clockwise and the gear D is held stationary. The gears A and D have 40 and 90 teeth respectively. The number of revolutions made by the arm is ________.

Question 16

Two gear wheels mesh externally and  give a gear ratio of 3.  The teeth are of involute form ; module = 6 mm, addendum = one module, pressure angle = 20°. If the pinion rotates at 90 r.p.m. Then the minimum number of teeth on the pinion to avoid interference is_________

Question 17

The amplitude of the steady state motion of the 10 kg mass shown below for a damping coefficient of c=500 N-s/m is _________ mm

Question 18

An alloy consists of 86% aluminium by weight and remaining 14% copper. Calculate the atom percentage of Aluminium in the composite if atomic weight of copper and aluminium are 63.59g/mole and 27g/mole respectively.

Question 19

Which of the following is a linear differential equation?

Question 20

The probabilities that three men hit a target  are 1/6, 1/4, 1/3 respectively. Each man shoot the target once. What is the probability that exactly one of them hits the target?

Question 21

A rectangular sheet of breadth 2m and length 15m moves through water in the longitudinal direction. The drag force on the two faces is estimated to be 9kN. Calculate the drag coefficient and boundary layer thickness at the trailing edge of the plate. Velocity of plate = 10m/s.

( Water )

Question 22

A thermocouple used to measure temperature of gas flowing through a duct records 280 .if emissivity is 0.4 and film coefficient is 150 W/m2K. The duct is at 140 . W/m2K4 . Find the temperature of flowing gas.

Question 23

In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotate at 100 rpm. The roll strip contact length will be ______ mm.

Question 24

In electrochemical machining, which of the portions of electrolyte obey Ohms law?

Question 25

Match the following

List - I

A. Coarse cementite in ferrite phase

B. Alternate layers of ferrite and cementite

C. Needle like shape of grains

D. Fine cementite in ferrite

List - II

1. Sorbite

2. Martensite

3. Pearlite

4. Troosite

Question 26

A drilling machine has 7 number of available speeds, with the minimum and maximum speeds of 30 rpm and 450 rpm. The fifth spindle speed (in rpm) will be _________.

Question 27

Consider two hydraulic turbines having identical specific speed and effective head at the inlet. If the speed ratio (N1/N2) of the two turbines is 2, then the respective power ratio (P1/P2) is ________

Question 28

For Laminar flow of an oil having dynamic viscosity μ = 1.67 Pa.s in a 0.2m diameter pipe, the velocity distribution is parabolic with a maximum point velocity of 2.5 m/s at the centre of the pipe. Calculate the shearing stresses at the pipe wall.

Question 29

1.80 m wide and 5 m long plate moves through a stationary air of density 1.22 kg/m3 and viscosity 1.8×10-4 Poise at a velocity of 1.75 m/s parallel to its length. The drag force on one side of the plate assuming turbulent flow conditions is_______?

Question 30

A pipe of 0.3 m diameter conveying 300 l/s of water has a right-angled bend in a horizontal plane. The resultant force exerted on bend if pressure at inlet and outlet of the bend are 24.525 N/cm2 and 23.544 N/cm2 is ___ N.

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